SIR Paul McCartney’s fame school has stepped in to rescue John Lennon’s world-famous art college from being turned into apartments.Liverpool Institute of Performing Arts (Lipa) has struck a £3.7m deal to buy 68 Hope Street – the Grade II-listed former art college building next door which famously houses the lecture hall where Lennon met his first wife, Cynthia.Dating back to the 1880s, the building was destined to be turned into luxury flats as part of a controversial £100m Maghull Developments proposal to redevelop Liverpool’s historic Hope Street.